Not sure if this is best place to put this but here it goes, I wish to join the infantry and potentially would make a career out of it. However my primary goal is to qualify as a close protection officer, I know from others that this profession favours those who have served in the army but what role/regiment/job choice in your opinions would be the most beneficial?

You need to choose. If you want to go to Infantry then just dedicate yourself to that and forget the CP bit till you have achieved an army infantry career. The CP work if still your aim you can pursue after.
The best CP companies normally prefer Ex Airborne soldiers.